US4725215A - Extruder with exchangeable filter for foamed plastic material - Google Patents

Extruder with exchangeable filter for foamed plastic material Download PDF

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Publication number
US4725215A
US4725215A US06/946,493 US94649386A US4725215A US 4725215 A US4725215 A US 4725215A US 94649386 A US94649386 A US 94649386A US 4725215 A US4725215 A US 4725215A
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US
United States
Prior art keywords
compartment
expansion chamber
inlet
carrier
passage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US06/946,493
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English (en)
Inventor
Udo Kreyenborg
Horst Koching
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nordson BKG GmbH
Original Assignee
Kreyenborg Verwaltung und Beteiligungen GmbH and Co KG
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Application filed by Kreyenborg Verwaltung und Beteiligungen GmbH and Co KG filed Critical Kreyenborg Verwaltung und Beteiligungen GmbH and Co KG
Assigned to KREYENBORG VERWALTUNGEN UND BETEILIGUNGEN KG, A GERMAN COMPANY reassignment KREYENBORG VERWALTUNGEN UND BETEILIGUNGEN KG, A GERMAN COMPANY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: KOCHING, HORST, KREYENBORG, UDO
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Publication of US4725215A publication Critical patent/US4725215A/en
Anticipated expiration legal-status Critical
Assigned to KREYENBORG GMBH reassignment KREYENBORG GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KREYENBORG VERWALTUNGEN UND BETEILIGUNGEN GMBH & CO. KG
Expired - Fee Related legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/36Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50Details of extruders
    • B29C48/69Filters or screens for the moulding material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/36Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50Details of extruders
    • B29C48/69Filters or screens for the moulding material
    • B29C48/693Substantially flat filters mounted at the end of an extruder screw perpendicular to the feed axis

Definitions

  • the invention relates to apparatus for processing plastic materials, and more particularly to improvements in extruders and like apparatus wherein a continuous stream of plastic material is caused to advance to one or more dies or mold cavities to be converted into a succession of discrete products or into one or more continuous products in the form of strands, sheets, rods, bars or the like.
  • German Pat. No. 29 42 849 to Kreyenborg discloses an apparatus wherein the flow of plastic material to a die or the like can be interrupted by a reciprocable holder for a series of filters in discrete compartments.
  • the filters can be moved into register with the passage so that the plastic material must penetrate through a selected filter in order to be relieved of foreign matter on its way toward the shaping station.
  • the arrangement is such that some plastic material can penetrate into a next-following filter compartment while the preceding filter compartment establishes communication between the inlet and outlet ends of the passage for plasticized material.
  • the next-following filter compartment is then connected with the atmosphere by a suitable valve so that it can be filled with plasticized material before it reaches the operative position of alignment with the passage.
  • the patented apparatus operates satisfactorily for the processing of unfoamed plastic materials.
  • German Auslegeschrift No. 2 153 962 of Buchheit et al. discloses an apparatus wherein the leader of a stream of plasticized material is permitted to escape by way of a bypass channel before the passage for the flow of plasticized material to the shaping station is traversed by a filter. This ensures that the improperly heated and/or air-containing and/or otherwise unacceptable portion of the stream of plasticized material is not converted into an unsatisfactory product. Moreover, it is possible to gain access to a filter while the plasticized material is caused to penetrate through a spare filter or into the aforementioned bypass channel.
  • German Offenlegungsschrift No. 2 130 501 of block-shaped filter holders can be advanced into register with the path for the flow of plasticized material toward the shaping station.
  • the holder which is maintained in a position of readiness can be filled with plasticized material in response to opening of a valve so that the plasticized material expels air before the holder advances to a position in which the plasticized material flowing toward the shaping station must penetrate through its filter or filters.
  • a drawback of the aforediscussed apparatus is that removal of a clogged filter can present problems, particularly injuries to attendants and/or contamination of the surrounding area, if the material to be converted into shaped plastic articles is a foamed thermoplastic substance which is maintained at an elevated pressure during flow toward the shaping station. Foaming is achieved by mixing the plasticized material with a suitable blowing or foaming agent which causes the plasticized material to expand upstream and/or downstream of the filter.
  • the filter compartment which is in register with the passage for the flow of plasticized material to the shaping station e.g., to a die with apertures for strands of foamed plastic material
  • the contents of the filter compartment expand abruptly as soon as the compartment is permitted to communicate with the surrounding atmosphere.
  • the material which is thereby expelled from the filter compartment can contaminate the area in and around the apparatus and can cause serious injury or injuries to the attendant or attendants, especially since the material leaving the filter compartment is normally maintained at an elevated temperature.
  • An object of the invention is to provide an extruder or a similar apparatus for processing foamed plastic material which is constructed and assembled in such a way that the heated and pressurized material which is confined in the filter compartment cannot cause damage and/or injury after the filter compartment leaves the position of alignment with the passage for the flow of foamed plastic material to one or more shaping stations.
  • Another object of the invention is to provide a novel and improved carrier for one or more filters and a novel and improved housing for the carrier.
  • a further object of the invention is to provide a novel and improved method of relieving the pressure of foamed plastic material in the filter compartment which is about to be relieved of its filter or filters.
  • An additional object of the invention is to provide a novel and improved method of effecting controlled expansion of the mixture of foaming agent and plasticized material in a filter compartment which must be rendered accessible for the purpose of inspecting or removing the filter or filters therein.
  • Still another object of the invention is to provide a novel and improved combination of filter carrier and housing for the filter carrier which can be used in existing extruders and like plastic processing apparatus as a superior substitute for heretofore known combinations.
  • Another object of the invention is to provide an extruder wherein the pressure in the filter compartment is automatically relieved in response to movement of the filter compartment to a position in which its filter or filters are accessible.
  • the invention is embodied in a combination of parts which can be used in an extruder or in a similar apparatus for making articles from foamed plastic material.
  • the combination comprises a housing member which defines a passage for the flow of foamed or foamable plastic material at an elevated pressure.
  • the passage has an inlet and an outlet which latter is spaced apart from the inlet, and the improved combination further comprises a carrier member which is movably installed in the housing member and has a compartment and filter means (e.g., a stack of sieves) in the compartment.
  • the housing member and/or the carrier member has at least one expansion chamber, and one of the members (e.g., the carrier member) is movable relative to the other member (and/or vice versa) between a first position in which the compartment connects the inlet with the outlet so that the plastic material must flow through the filter means on its way from the inlet to the outlet, and a second position in which the compartment is sealed from the outlet and/or inlet of the passage and the compartment is connected or connectable with the expansion chamber to relieve the pressure in the compartment.
  • one of the members e.g., the carrier member
  • the expansion chamber can be provided in the carrier member and the latter then further comprises means (e.g., a valve) for normally sealing the compartment from the expansion chamber but for permitting the flow of plastic material from the compartment into the expansion chamber (a) in automatic response to movement of the compartment to a position in which the compartment is sealed from the passage or (b) at the will of the operator.
  • means e.g., a valve
  • the expansion chamber is provided in the housing member and communicates with the compartment in response to movement of the movable member to its second position.
  • Such movable member is movable, or can be moved, to a third position between the first and second positions in which the compartment is sealed from the passage as well as from the expansion chamber.
  • the arrangement may be such that the filter means is accessible or can be made accessible in the second position or in a further position of the movable member.
  • a portion of the expansion chamber can be defined by the interior of a vessel which can form part of the housing member.
  • the vessel can be movably mounted on the main portion of the housing member, and the latter can be formed with a channel which forms part of the expansion chamber and establishes communication between the filter compartment and the interior of the vessel in the second position of the movable member.
  • a fluid-operated motor or other suitable means can be provided to move the movable member relative to the other member or vice versa.
  • the housing member can be provided with a bore which extends transversely of and intersects the passage between the inlet and the outlet, and the carrier member is then sealingly received and is reciprocable in the bore.
  • the compartment of the carrier member can be provided with a relatively large material admitting portion which communicates with the inlet and with a relatively small material discharging portion which communicates with the outlet of the passage in the first position of the movable member. The material admitting portion of the compartment communicates or can be caused to communicate with the expansion chamber in the second position of the movable member.
  • FIG. 1 is a fragmentary partly elevational and partly sectional view of an extruder which embodies the invention
  • FIG. 2 shows the structure of FIG. 1 but with the carrier member in a different position
  • FIG. 3 shows the structure of FIG. 1 but with the carrier member in a third position
  • FIG. 4 shows a portion of a modified extruder wherein a portion of the expansion chamber is defined by a vessel which is pivotably mounted on the housing member, the carrier member being shown in a fourth position.
  • FIGS. 1 to 3 show a portion of an extruder wherein a housing member 1 (hereinafter called housing for short) has a cylindrical bore 2 for a reciprocable plunger-like carrier member 3 (hereinafter carrier) for one or more filters 5.
  • the housing 1 is further formed with a diametrically extending passage 6 having an inlet at one side and an outlet at the opposite side of the reciprocable carrier 3.
  • the source of foamed plastic material which is admitted into the inlet of the passage 6 is not shown; the outlet of this passage conveys material to a station where the material is converted into one or more continuous products or into series of discrete products in a manner not forming part of the invention.
  • the outlet of the passage 6 can admit material into one or more mold cavities or into one or more holes of a die which causes the plastic material to form one or more strands, plates, sheets, bars, rods or the like.
  • the carrier 3 defines a filter compartment 4 which removably receives the filter 5; the latter can constitute a package of discrete filters or sieves serving to intercept any foreign matter which flows from the inlet to the outlet of the passage 6 when the carrier 1 is held in a first position (FIG. 1) in which the compartment 4 establishes a path for the flow of foamed plastic material from the inlet to the outlet.
  • the material which flows from the inlet toward the outlet of the passage 6 can contain a mixture of thermoplastic material and a suitable blowing or foaming agent. The two constituents of the mixture are brought into contact with one another ahead of the inlet of the passage 6, and the foaming agent causes or can cause the pressure of the mixture which fills the compartment 4 to rise well above atmospheric pressure.
  • the housing 1 is formed with a channel 7 which constitutes or forms part of an expansion chamber and allows the pressure in the compartment 4 to drop in response to movement of the carrier 3 to the (second) position of FIG. 3 in which the relatively large material admitting portion of the compartment 4 communicates with the channel 7.
  • the outer end of the channel 7 is or can be sealed to prevent abrupt escape of pressurized material from the compartment 4.
  • the distance between the channel 7 and the inlet of the passage 6 (as considered in the axial direction of the bore 2) can be selected in such a way that the carrier 3 can assume an intermediate (third) position which is shown in FIG. 2 and in which the compartment 4 is sealed from the passage 6 as well as from the expansion chamber (channel 7).
  • the carrier 3 automatically reaches the position of FIG. 2 on its way from the position of FIG. 1 to the position of FIG. 3 or vice versa.
  • the carrier 3 is thereupon moved to a further position (FIG. 4) in which the compartment 4 is accessible to allow for removal of the filter 5 and for insertion of a fresh filter.
  • FIG. 4 shows that the expansion chamber can be defined in part by a vessel 8 (e.g., a pan-shaped receptacle) which can be said to form part of the housing 1 and is pivotably mounted on the main portion of the housing.
  • the channel 7 establishes communication between the compartment 4 and the interior of the vessel 8 when the carrier 3 assumes a position corresponding to that shown in FIG. 3.
  • the carrier 3 is thereupon moved to the position which is shown in FIG. 4 and in which the filter 5 in the compartment 4 is accessible in response to pivoting of the vessel 8 to its open or inoperative position.
  • the housing 1 comprises suitable means for sealing the interior of the vessel 8 and the channel 7 from the atmosphere when the vessel is held in the operative position.
  • the vessel 8 can be used with advantage when the material in the compartment 4 is maintained at an elevated pressure so that its expansion into the channel 7 does not suffice to ensure that the compartment 4 can be exposed without endangering the attendants and/or contaminating the apparatus.
  • FIG. 1 shows that the apparatus can comprise several expansion chambers including that which comprises or is formed by the channel 7 and a chamber in the form of a channel 9 provided in the carrier 3 and normally sealed from the compartment 4 by a valve 10 or by other suitable sealing means.
  • the valve 10 is opened automatically in response to movement of the carrier 3 to the position of FIG. 3 or by hand as soon as or after the carrier reaches the position of FIG. 3.
  • the material which fills the compartment 4 is then free to expand into the channel 7 and into the channel 9.
  • the means e.g., a fluid-operated motor which is used to move the carrier 3 between its positions (e.g., four positions including those shown in FIGS. 1, 2, 3 and 4) is not shown in the drawing.
  • the pressure in the compartment 4 rises under the action of the foaming agent and also because the cross-sectional area of the material discharging portion of the compartment 4 is smaller than that of the material admitting portion.
  • the carrier 1 can be provided with two or more compartments 4 for discrete filters 5 or groups of filters.
  • the improved apparatus reliably eliminates the danger of injury to the attendants and/or contamination of the apparatus. This is due to controlled reduction of pressure of material which fills the compartment 4 before the filter 5 in the compartment is accessible (e.g., by way of the opening which is normally sealed by the vessel 8).
  • the vessel 8 collects the material which issues from the compartment 4 by way of the channel 7 when the carrier 3 reaches the position of FIG. 3.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
US06/946,493 1986-02-26 1986-12-24 Extruder with exchangeable filter for foamed plastic material Expired - Fee Related US4725215A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3606138 1986-02-26
DE3606138A DE3606138C1 (de) 1986-02-26 1986-02-26 Filtereinrichtung fuer Strangpressen und Spritzgiessmaschinen fuer schaeumbare Thermoplasten

Publications (1)

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US4725215A true US4725215A (en) 1988-02-16

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DE (1) DE3606138C1 (de)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4880374A (en) * 1987-05-20 1989-11-14 Fuji Photo Film Co., Ltd. Filter exchange device for an extrusion molding machine
US5004414A (en) * 1988-12-05 1991-04-02 Kreyenborg Verwaltungen Und Beteiligungen Kg Apparatus for filtering plasticized materials in extruders and like machines
US5122286A (en) * 1989-12-19 1992-06-16 Kreyenborg Verwaltungen Und Beteiligungen Kg Filter changing apparatus for flowable plastic material
US5125823A (en) * 1990-04-19 1992-06-30 Kreyenborg Verwaltungen Und Beteiligungen Kg Apparatus for filtering plasticized materials
AU651834B2 (en) * 1990-07-23 1994-08-04 Erema Engineering Recycling Maschinen Und Anlagen Gesellschaft M.B.H. Filter for thermoplastic material
US5411389A (en) * 1992-12-21 1995-05-02 Bayer Aktiengesellschaft Apparatus for the continuous production of foamed plastics
US5417866A (en) * 1993-07-02 1995-05-23 Extek, Inc. Continuous flow polymer filtration apparatus and process
US5578206A (en) * 1993-12-27 1996-11-26 The Japan Steel Works, Ltd. Screen pack replacing apparatus
US5607583A (en) * 1995-07-03 1997-03-04 Kreyenborg, Inc. Filter device for extruders and injection-molding machines
US5770067A (en) * 1996-03-29 1998-06-23 Wil-Man Polymer Filtration Gmbh Device for filtering a fluid
US5890514A (en) * 1995-10-30 1999-04-06 Nordson Corporation Shutoff valve and filter in thermoplastic material supply system
US20040043094A1 (en) * 2002-08-30 2004-03-04 Wengermanufacturing, Inc. Method and apparatus for extrusion of food products including back pressure valve/diverter
US20210162324A1 (en) * 2016-10-17 2021-06-03 Next Generation Analytics Gmbh Filter system for viscous or highly viscous liquids, in particular plastic melts and method for filtering viscous or highly viscous liquids
EP3984720A1 (de) * 2020-10-15 2022-04-20 BD Plast Filtering Systems S.r.l. Filtervorrichtung zum filtern von extrudierten polymeren und reinigungsverfahren
US20220355531A1 (en) * 2018-05-07 2022-11-10 PSI-Polymer Systems, Inc. Filtration apparatuses and screen changer devices for polymer processing and related methods

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3455357A (en) * 1967-02-03 1969-07-15 Beringer Co Inc C J Screen changer apparatus for extrusion machines
DE2130501A1 (de) * 1971-04-08 1972-10-12 Cosham Engineering And Design Vorrichtung zum Auswechseln von Sieben
US3804758A (en) * 1972-03-29 1974-04-16 Cosham Eng Design Ltd Screen changer
US3900399A (en) * 1972-11-18 1975-08-19 Joachim Kreyenborg Filter apparatus for extrusion presses
US4025434A (en) * 1975-10-06 1977-05-24 Bolton-Emerson, Inc. Screen changer with pre-fill screen blocks
US4202659A (en) * 1977-03-15 1980-05-13 Nihon Repro Machine Kogyo Kabushiki Kaisha Device for changing a wire netting in a filter device for synthetic resins
DE2942849A1 (de) * 1979-10-24 1981-05-07 Joachim Kreyenborg & Co, 4400 Münster Filtereinrichtung fuer strangpressen
US4507072A (en) * 1982-10-25 1985-03-26 E. I. Dupont De Nemours And Company Diverting plate
US4588502A (en) * 1983-12-06 1986-05-13 Detlef Gneuss Sieve device for cleaning molten plastics

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3455357A (en) * 1967-02-03 1969-07-15 Beringer Co Inc C J Screen changer apparatus for extrusion machines
DE2130501A1 (de) * 1971-04-08 1972-10-12 Cosham Engineering And Design Vorrichtung zum Auswechseln von Sieben
US3804758A (en) * 1972-03-29 1974-04-16 Cosham Eng Design Ltd Screen changer
US3900399A (en) * 1972-11-18 1975-08-19 Joachim Kreyenborg Filter apparatus for extrusion presses
US4025434A (en) * 1975-10-06 1977-05-24 Bolton-Emerson, Inc. Screen changer with pre-fill screen blocks
US4202659A (en) * 1977-03-15 1980-05-13 Nihon Repro Machine Kogyo Kabushiki Kaisha Device for changing a wire netting in a filter device for synthetic resins
DE2942849A1 (de) * 1979-10-24 1981-05-07 Joachim Kreyenborg & Co, 4400 Münster Filtereinrichtung fuer strangpressen
US4507072A (en) * 1982-10-25 1985-03-26 E. I. Dupont De Nemours And Company Diverting plate
US4588502A (en) * 1983-12-06 1986-05-13 Detlef Gneuss Sieve device for cleaning molten plastics

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4880374A (en) * 1987-05-20 1989-11-14 Fuji Photo Film Co., Ltd. Filter exchange device for an extrusion molding machine
US5004414A (en) * 1988-12-05 1991-04-02 Kreyenborg Verwaltungen Und Beteiligungen Kg Apparatus for filtering plasticized materials in extruders and like machines
US5122286A (en) * 1989-12-19 1992-06-16 Kreyenborg Verwaltungen Und Beteiligungen Kg Filter changing apparatus for flowable plastic material
US5125823A (en) * 1990-04-19 1992-06-30 Kreyenborg Verwaltungen Und Beteiligungen Kg Apparatus for filtering plasticized materials
AU651834B2 (en) * 1990-07-23 1994-08-04 Erema Engineering Recycling Maschinen Und Anlagen Gesellschaft M.B.H. Filter for thermoplastic material
US5411389A (en) * 1992-12-21 1995-05-02 Bayer Aktiengesellschaft Apparatus for the continuous production of foamed plastics
US5417866A (en) * 1993-07-02 1995-05-23 Extek, Inc. Continuous flow polymer filtration apparatus and process
US5578206A (en) * 1993-12-27 1996-11-26 The Japan Steel Works, Ltd. Screen pack replacing apparatus
US5607583A (en) * 1995-07-03 1997-03-04 Kreyenborg, Inc. Filter device for extruders and injection-molding machines
US5890514A (en) * 1995-10-30 1999-04-06 Nordson Corporation Shutoff valve and filter in thermoplastic material supply system
US5770067A (en) * 1996-03-29 1998-06-23 Wil-Man Polymer Filtration Gmbh Device for filtering a fluid
US20040043094A1 (en) * 2002-08-30 2004-03-04 Wengermanufacturing, Inc. Method and apparatus for extrusion of food products including back pressure valve/diverter
US6773739B2 (en) 2002-08-30 2004-08-10 Wenger Manufacturing, Inc Method and apparatus for extrusion of food products including back pressure valve/diverter
US20210162324A1 (en) * 2016-10-17 2021-06-03 Next Generation Analytics Gmbh Filter system for viscous or highly viscous liquids, in particular plastic melts and method for filtering viscous or highly viscous liquids
US20220355531A1 (en) * 2018-05-07 2022-11-10 PSI-Polymer Systems, Inc. Filtration apparatuses and screen changer devices for polymer processing and related methods
EP3984720A1 (de) * 2020-10-15 2022-04-20 BD Plast Filtering Systems S.r.l. Filtervorrichtung zum filtern von extrudierten polymeren und reinigungsverfahren
US11980836B2 (en) 2020-10-15 2024-05-14 Bd Plast Filtering Systems S.R.L. Filter device for filtering extruded polymers and cleaning method
US12090425B2 (en) 2020-10-15 2024-09-17 Bd Plast Filtering Systems S.R.L. Filter device for filtering extruded polymers and cleaning method

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Publication number Publication date
DE3606138C1 (de) 1987-05-07

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